package com.sky.service.impl;

import com.sky.dto.GoodsSalesDTO;
import com.sky.entity.Orders;
import com.sky.mapper.OrderMapper;
import com.sky.mapper.UserMapper;
import com.sky.service.ReportService;
import com.sky.vo.*;
import lombok.extern.slf4j.Slf4j;
import org.apache.commons.lang3.StringUtils;
import org.apache.poi.xssf.usermodel.XSSFRow;
import org.apache.poi.xssf.usermodel.XSSFSheet;
import org.apache.poi.xssf.usermodel.XSSFWorkbook;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

import javax.servlet.ServletOutputStream;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;
import java.io.InputStream;
import java.time.LocalDate;
import java.time.LocalDateTime;
import java.time.LocalTime;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.stream.Collectors;

@Service
@Slf4j
public class ReportServiceImpl implements ReportService {

    @Autowired
    private OrderMapper orderMapper;

    @Autowired
    private UserMapper userMapper;

    @Autowired
    private WorkspaceServiceImpl workspaceService;

     /**
     * 统计指定时间区间内的营业额数据
     * @param begin
     * @param end
     * @return
     */
    public TurnoverReportVO getTurnoverStatistics(LocalDate begin, LocalDate end) {

        //根据起始日期补全，并返回List<LocalDate>集合
        List<LocalDate> dateList = getDateList(begin, end);

        //存放每天的营业额
        List<Double> turnoverStatistics = new ArrayList<>();
        for (LocalDate date : dateList) {

            //select sum(amount) from orders where order_time > beginTime and order_time < endTime and status = 5

            //将 年-月-日 转为 年-月-日-时-分-秒，并将当天的起止时间封装进 Map集合
            Map map = getMap(date);

            map.put("status", Orders.COMPLETED);

            //查询date日期对应的营业额数据，营业额是指：状态为“已完成”的订单金额合计
            Double turnover = orderMapper.sumByMap(map);
            turnover = turnover == null ? 0.0 : turnover;
            turnoverStatistics.add(turnover);
        }

        return TurnoverReportVO
                .builder()
                .dateList(StringUtils.join(dateList,","))
                .turnoverList(StringUtils.join(turnoverStatistics,","))
                .build();
    }

    /**统计指定时间区间内的用户数据
     *
     * @param begin
     * @param end
     * @return
     */
    public UserReportVO getUserStatistics(LocalDate begin, LocalDate end) {

        //根据起始日期补全，并返回List<LocalDate>集合
        List<LocalDate> dateList = getDateList(begin, end);

        //每天新增用户数量  select count(id) from user where create_time > begin and create_time < end
        List<Integer> newUserList = new ArrayList<>();
        //每天总用户数量   select count(id) from user where  create_time < end
        List<Integer> totalUserList = new ArrayList<>();

        for (LocalDate date : dateList) {
            LocalDateTime beginTime = LocalDateTime.of(date,LocalTime.MIN);
            LocalDateTime endTime = LocalDateTime.of(date,LocalTime.MAX);

            Map map = new HashMap();

            map.put("end",endTime);
            //总用户数量
            Integer totalUser = userMapper.countByMap(map);

            map.put("begin",beginTime);
            //新增的用户数量
            Integer newUser = userMapper.countByMap(map);

            newUserList.add(newUser);
            totalUserList.add(totalUser);

        }
        return UserReportVO
                .builder()
                .dateList(StringUtils.join(dateList,","))
                .newUserList(StringUtils.join(newUserList,","))
                .totalUserList(StringUtils.join(totalUserList,","))
                .build();
    }

    /**
     * 统计指定时间区间内的订单数据
     * @param begin
     * @param end
     * @return
     */
    public OrderReportVO getOrdersStatistics(LocalDate begin, LocalDate end) {

        //根据起始日期补全，并返回List<LocalDate>集合
        List<LocalDate> dateList = getDateList(begin, end);

        //订单总数
        Integer totalOrderCount=0;
        //有效订单数
        Integer validOrderCount=0;

        //订单总数集合
        List<Integer> orderCountList = new ArrayList<>();
        //有效订单数集合
        List<Integer> validOrderCountList = new ArrayList<>();

        for (LocalDate date : dateList) {
            //将 年-月-日 转为 年-月-日-时-分-秒，并将当天的起止时间封装进 Map集合
            Map map = getMap(date);

            //查询当天的所有状态的订单数量
            Integer totalOrder = orderMapper.countByMap(map);

            //查询当天 已完成订单的数量
            map.put("status",Orders.COMPLETED);
            Integer validOrder = orderMapper.countByMap(map);


            totalOrderCount += totalOrder;           //加上当天 订单总数
            validOrderCount += validOrder;           //加上当天 有效订单 的数量
            orderCountList.add(totalOrder);          //将当天 总订单数量 添加到 订单总数集合中
            validOrderCountList.add(validOrder);     //将当天 有效订单 数量添加到有效订单集合中
        }

//        Integer totalOrderCount = orderCountList.stream().reduce(Integer::sum).get();

        //将Integer转为Double
        Double orderCompletionRate =  0.0;
        if(totalOrderCount !=0 ){
            orderCompletionRate = validOrderCount.doubleValue()/totalOrderCount;
        }

        return OrderReportVO
                .builder()
                .dateList(StringUtils.join(dateList,","))
                .orderCountList(StringUtils.join(orderCountList,","))
                .validOrderCountList(StringUtils.join(validOrderCountList,","))
                .totalOrderCount(totalOrderCount)
                .validOrderCount(validOrderCount)
                .orderCompletionRate(orderCompletionRate)
                .build();
    }

    /**
     * 查询销量排名top10接口
     * @param begin
     * @param end
     * @return
     */
    public SalesTop10ReportVO getSalesTop10Report(LocalDate begin, LocalDate end) {

        LocalDateTime beginTime = LocalDateTime.of(begin,LocalTime.MIN);
        LocalDateTime endTime = LocalDateTime.of(end,LocalTime.MAX);

        List<GoodsSalesDTO> salesTop10 = orderMapper.getSalesTop10(beginTime, endTime);

        List<String> names = salesTop10.stream().map(GoodsSalesDTO::getName).collect(Collectors.toList());
        String nameList = StringUtils.join(names,",");
        List<Integer> numbers = salesTop10.stream().map(GoodsSalesDTO::getNumber).collect(Collectors.toList());
        String numberList = StringUtils.join(numbers,",");
        return new SalesTop10ReportVO(nameList,numberList);
    }

    /**
     * 导出运营数据报表
     * @param response
     */
    public void exportBusinessDate(HttpServletResponse response) {
        //1.查询数据库，获取营业数据 (查询最近30天的)
        LocalDate dateBegin = LocalDate.now().minusDays(30);    //获取当前时间往前30天
        LocalDate dateEnd = LocalDate.now().minusDays(1);       //获取当前时间往前1天, 即昨天


        //查询营业额数据
        BusinessDataVO businessDataVo = workspaceService.getBusinessData(LocalDateTime.of(dateBegin, LocalTime.MIN), LocalDateTime.of(dateEnd, LocalTime.MAX));

        //2.通过POI将数据写入到Excel文件中
        //获得类对象，的类加载器
        InputStream in = this.getClass().getClassLoader().getResourceAsStream("template/运营数据报表模板.xlsx");


        try {
            //基于模板文件创建一个新的Excel文件
            XSSFWorkbook excel = new XSSFWorkbook(in);

            //获得表格文件Sheet标签页
            XSSFSheet sheet = excel.getSheet("Sheet1");

            //填充数据--时间
            sheet.getRow(1).getCell(1).setCellValue("时间: "+dateBegin+"至"+dateEnd);

            //获得第4行
            XSSFRow row = sheet.getRow(3);
            row.getCell(2).setCellValue(businessDataVo.getTurnover());
            row.getCell(4).setCellValue(businessDataVo.getOrderCompletionRate());
            row.getCell(6).setCellValue(businessDataVo.getNewUsers());

            //获得第五行
            row = sheet.getRow(4);
            row.getCell(2).setCellValue(businessDataVo.getValidOrderCount());
            row.getCell(4).setCellValue(businessDataVo.getUnitPrice());

            //填充明细数据
            for(int i = 0; i < 30; i++){
                LocalDate date = dateBegin.plusDays(i);
                //查询某一天的营业额数据
                BusinessDataVO businessData = workspaceService.getBusinessData(LocalDateTime.of(date, LocalTime.MIN), LocalDateTime.of(date, LocalTime.MAX));

                //获得某一天
                row  = sheet.getRow(7+i);
                row.getCell(1).setCellValue(date.toString());
                row.getCell(2).setCellValue(businessData.getTurnover());
                row.getCell(3).setCellValue(businessData.getValidOrderCount());
                row.getCell(4).setCellValue(businessData.getOrderCompletionRate());
                row.getCell(5).setCellValue(businessData.getUnitPrice());
                row.getCell(6).setCellValue(businessData.getNewUsers());

            }


            //3.通过输出流将Excel文件下载到客户端浏览器
            ServletOutputStream out = response.getOutputStream();
            excel.write(out);

            //关闭资源
            out.close();
            excel.close();

        } catch (IOException e) {
            throw new RuntimeException(e);
        }



    }

    /**
     * 根据起始日期补全，并返回List<LocalDate>集合
     * @param begin
     * @param end
     * @return
     */
    public List<LocalDate> getDateList(LocalDate begin, LocalDate end) {

        //当前集合用来存放从begin到end范围内的每天的日期
        List<LocalDate> dateList = new ArrayList<>();

        dateList.add(begin);

        while (!begin.equals(end)){
            //日期方法往后加1天
            begin = begin.plusDays(1);
            dateList.add(begin);
        }

        return dateList;
    }

    /**
     *将 年-月-日 转为 年-月-日-时-分-秒，并将当天的起止时间封装进 Map集合
     * @param date
     * @return
     */
    public Map getMap(LocalDate date) {
        LocalDateTime beginTime = LocalDateTime.of(date,LocalTime.MIN);
        LocalDateTime endTime = LocalDateTime.of(date,LocalTime.MAX);
        Map map = new HashMap();
        map.put("begin",beginTime);
        map.put("end",endTime);
        return map;
    }
}
